Shelf



FIG. 1 is a front perspective view of a shelf, showing my new design;

FIG. 2 is rear perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof;

FIG. 9 is a partial enlarged view of FIG. 1 ;

FIG. 10 is a partial enlarged view of FIG. 1 ;

FIG. 11 is a partial enlarged view of FIG. 2 ;

FIG. 12 is a partial enlarged view of FIG. 2 ;

FIG. 13 is a partial enlarged view of FIG. 3 ;

FIG. 14 is a partial enlarged view of FIG. 4 ;

FIG. 15 is a partial enlarged view of FIG. 5 ;

FIG. 16 is a partial enlarged view of FIG. 6 ;

FIG. 17 is a partial enlarged view of FIG. 7 ; and,

FIG. 18 is a partial enlarged view of FIG. 8 . 

CLAIM The ornamental design for a shelf, as shown and described. 